Phytoalexins from Brassicaceae: News from the front

Pedras, M. Soledade C.; Yaya, Estifanos Ele

doi:10.1016/j.phytochem.2010.03.020

Cited by 53 publications

(41 citation statements)

References 43 publications

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“…A better understanding of their mode of action and of the detoxification mechanisms used by pathogens to bypass this line of defence will promote biotechnological strategies based on the directed control of phytoalexin production in specific tissues and at specific developmental stages (Ahuja et al 2012). An example for such advanced plant-protection strategies is the application of phytoalexin detoxification inhibitors, for example, paldoxins, to cure specific fungal diseases (Pedras et al 2007;Pedras 2008;Pedras and Yaya 2010). Interestingly, there exist phytoalexins from Brassicaceae that in turn inhibit fungal detoxifying enzymes, demonstrating that phytoalexins can convey various and different ecological functions.…”

Section: The Biosynthesis and Role Of Sulphur-based Phytoalexinsmentioning

confidence: 99%

Applied Cell Biology of Sulphur and Selenium in Plants

Khan¹,

Hell

2013

Plant Cell Monographs

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Sulphur (S) is required in considerable amounts by all organisms, while selenium (Se) is beneficial for plants and essential for animals albeit in only small amounts. Due to their chemical similarity that is in parts also shared with molybdenum and chromium, inorganic sulphate and selenate are taken up by plants and assimilated in reduced form into organic compounds, most notably cysteine and selenocysteine, respectively. Uptake, reduction, and storage of S and Se compounds underlie complex cellular processes that need to be understood before successful translation into improved plants for human and animal diets can be achieved. Genetic engineering, breeding, and plant production approaches use insights from cell biology and basic research to introduce tailor-made desirable traits related to S and Se metabolism. Several examples for this approach will be discussed. In terms of enhanced crop quality, the so-called push and pull approaches to improve seed S amino acid compositions draw heavily from cell biology research. In pull or sink approaches, the expression of S-rich seed storage proteins is put under the control of seed-specific promoters. Such proteins possibly carry a targeting signal for the endoplasmic reticulum to achieve deposition in protein bodies. The regulation of some health-promoting compounds of Se together with S compounds such as glucoraphanin in Brassicaceae has received considerable attention in the recent past. However, to achieve high contents of Se metabolites simultaneously with the health-promoting S-containing compounds is challenging due to the crosstalk between the two pathways. The concept of S-enhanced defence linking S nutrition of plants with enhanced synthesis of S-containing defence compounds has been supported by considerable experimental data from basic research. Some of the

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Section: The Biosynthesis and Role Of Sulphur-based Phytoalexinsmentioning

confidence: 99%

Applied Cell Biology of Sulphur and Selenium in Plants

Khan¹,

Hell

2013

Plant Cell Monographs

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“…in the Brassica genus. This genus covers species that have been cultivated and consumed worldwide for centuries (Katz, 2003;Pedras and Yaya, 2010).…”

Section: Introductionmentioning

confidence: 99%

Arsenic accumulation in Brassicaceae seedlings and its effects on growth and plant anatomy

Freitas-Silva

Araújo

Silva

et al. 2016

Ecotoxicology and Environmental Safety

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We wished to evaluate the effects of arsenic on the morphology and anatomy of Brassica oleracea, Raphanus sativus, Brassica juncea, Brassica oleracea var. capitata and Brassica oleracea var. italica. Seeds were subjected to concentrations 0µM, 250µM, 350µM and 450µM arsenic in the form of sodium arsenate (Na2HAsO4·7H2O) during 12 days. All species accumulated more arsenic in the roots than in the shoots, except for B. oleracea var. capitata. There was no difference of translocation factor between species and treatments. Growth decrease was observed in roots of B. oleracea and R. sativus, and in shoots of R. sativus and B. oleracea var. italica. All species presented anatomical alterations in the roots, such as: cell hypertrophy, protoplast retraction, cellular plasmolysis, and necrotic regions. B. juncea presented collapse and hypertrophy of cells from the leaf blade tissues. Quantitative anatomical analyses performed on the root and leaves of B. oleracea and B. juncea revealed that arsenic interfered on the root vascular cylinder diameter and on height of epidermal cells of the adaxial leaf surface of both species. We concluded that arsenic was absorbed from the culture medium and induced alterations both on root and shoot growth of the seedlings. Retention of arsenic within the root was responsible for major damage in this organ.

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“…Immersion of tomato roots in solutions of five phenolics namely pyrocatechol (124), hydroquinone (129), phloroglucinol (130), pyrogallol (131), and orcinol (132) inhibited the infection by R. reniformis [104].…”

Section: Phenols and Phenolic Acidsmentioning

confidence: 99%

“…[127][128][129]. When resistant plants are infected by nematodes, phytoalexins with antinematodal activity can be produced [127,130].…”

Section: Flavonoidsmentioning

confidence: 99%